if (document.images) {
  imageAon = new Image();
  imageAon.src = "images/contract_sterilizationON.jpg";

  imageAoff = new Image();
  imageAoff.src = "images/contract_sterilization.jpg";

  imageBon = new Image();
  imageBon.src = "images/contract_manufacturingON.jpg";
  
  imageBoff = new Image();
  imageBoff.src = "images/contract_manufacturing.jpg";
   
  imageCon = new Image();
  imageCon.src = "images/warehousingON.jpg";
  
  imageCoff = new Image();
  imageCoff.src = "images/warehousing.jpg";

}


function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}